netdev - Re: [PATCH bpf 0/5] bpf: allow wide (u64) aligned loads for some fields of bpf_sock

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Message-ID: <a027661f-462b-51c0-a71f-a937eecf4317@iogearbox.net>
Date:   Tue, 16 Jul 2019 00:21:59 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org, Yonghong Song <yhs@...com>
Subject: Re: [PATCH bpf 0/5] bpf: allow wide (u64) aligned loads for some
 fields of bpf_sock_addr

On 7/15/19 6:39 PM, Stanislav Fomichev wrote:
> When fixing selftests by adding support for wide stores, Yonghong
> reported that he had seen some examples where clang generates
> single u64 loads for two adjacent u32s as well:
> http://lore.kernel.org/netdev/a66c937f-94c0-eaf8-5b37-8587d66c0c62@fb.com
> 
> Let's support aligned u64 reads for some bpf_sock_addr fields
> as well.
> 
> (This can probably wait for bpf-next, I'll defer to Younhong and the
> maintainers.)
> 
> Cc: Yonghong Song <yhs@...com>
> 
> Stanislav Fomichev (5):
>   bpf: rename bpf_ctx_wide_store_ok to bpf_ctx_wide_access_ok
>   bpf: allow wide aligned loads for bpf_sock_addr user_ip6 and
>     msg_src_ip6
>   selftests/bpf: rename verifier/wide_store.c to verifier/wide_access.c
>   selftests/bpf: add selftests for wide loads
>   bpf: sync bpf.h to tools/
> 
>  include/linux/filter.h                        |  2 +-
>  include/uapi/linux/bpf.h                      |  4 +-
>  net/core/filter.c                             | 24 ++++--
>  tools/include/uapi/linux/bpf.h                |  4 +-
>  .../selftests/bpf/verifier/wide_access.c      | 73 +++++++++++++++++++
>  .../selftests/bpf/verifier/wide_store.c       | 36 ---------
>  6 files changed, 95 insertions(+), 48 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/verifier/wide_access.c
>  delete mode 100644 tools/testing/selftests/bpf/verifier/wide_store.c
> 

Applied, thanks!